You may have a closed valley or an open valley. The only problem with a closed valley is the appearance of built up material or “hump” in your roof from the overlap. With a open valley design you eliminate that hump and provide an excellent way to divert water from your roof.
Stepped flashings have a stair case look that allows you to follow the grout line of the brick or irregularities of sidewalls. This option requires a higher level of workmanship to execute correctly and is more expensive than straight flashings.
Straight flashings simply follow a straight line along the sidewall and are typically sealed to the sidewall using a caulking. This option is less expensive, but does not allow you to follow the irregularities as well as stepped flashings.
Advantages and Disadvantages of Roofing Materials
Over or Under Ventilating
More ventilation is not always a good thing. Often times roofers will miscalculate the number of vents required for propped ventilation, or will add more vents upon request of the homeowner. This can cause problems with the airflow in your attic. It is important when designing a ventilation system that you abide by all codes and manufacturers recommendations. The standard rule of thumb is 1 square foot of ventilation for every 300 square feet of attic space, although this can vary depending on your roof slope and design. Remember; always have a balanced ventilation system. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.
Plugged Soffit Ventilation
Even though your soffit vents appear perforated from the exterior of the home, it is very important to make sure that air is flowing through them and into the attic. Many times homeowners, and even professionals, will mistakenly cover over their soffits with insulation. This can trap moisture in your attic and lead to condensation problems. Having adequate intake ventilation is equally as important as the exhaust ventilation. In the event that soffits are blocked you can install Moore vents (Styrofoam baffles that channel the airflow to the attic) or simply pull the insulation away from the soffits to free up the airflow. Moore vents are typically found on newly constructed homes.
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Tall City Roofing is a Midland, Texas based Roofing Company. We are both a Commercial and Residential Roofing Company. We service All of West Texas including: Midland, Odessa, Andrews, Monahans, Fort Stockton, Big Springs, Snyder, Stanton, Kermit, and San Angelo, TX.
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Home builders and designers do not always have the best interest of the roofing system and watershed in mind. A dead valley is an area on a roofing system created by the junction of two slopes, or a slope with a wall, where water cannot run off the roof easily. These areas are very low sloped and sometimes completely flat. Similarly to any low sloped roof, proper low sloped materials should be used that can handle slow water run off without premature deterioration occurring. Too often roofers will shingle over these areas without the proper underlayment which can cause homeowners hundreds of dollars. Protect yourself the first time by using a designated low slope material. It will cost more up front, but it is the right thing to do for the longevity of your roof.